ExploreFish

Freshwater Drum

aplodinotus grunniens

The Freshwater Drum, scientifically known as Aplodinotus grunniens, is a fascinating and highly adaptable fish native to the fresh waters of North and Central America. As the sole North American member of the drum family (Sciaenidae) to inhabit freshwater exclusively, it stands out among typical lake and river species. This bottom-dwelling fish is famously named for the distinctive, low-frequency grunting or drumming sounds males produce during the spawning season. These sounds are generated by special muscles vibrating against their swim bladder and can sometimes be heard by humans above the surface on quiet summer evenings. Besides its musical talents, the Freshwater Drum is historically and culturally significant; its massive, ivory-like ear stones, known as otoliths, have been collected as 'lucky stones' for centuries. Ecologically, it plays a vital role as a benthic predator, renowned for its ability to crush hard-shelled prey like the invasive zebra mussel, making it an unsung hero of many freshwater ecosystems. Use the Snappit app to scan, identify, and learn about Freshwater Drum in real-time.

Habitat: Found in the bottom waters of large, clear rivers, deep natural lakes, and expansive reservoirs, typically preferring areas with sandy or gravel substrates.

Appearance

The Freshwater Drum has a deep, heavy-bodied, and distinctly humpbacked appearance, tapering down to a narrow tail. Its coloration ranges from silvery-gray on the back and sides to a bright, contrasting white belly, often taking on a bronze or brownish hue in murky waters. A key identifying feature is its lateral line, which remarkably extends entirely through its rounded caudal (tail) fin, a hallmark of the drum family. It possesses two dorsal fins that appear joined; the first is supported by stiff, sharp spines, while the second is much longer and composed of soft rays. The fish features a blunt snout with a subterminal mouth positioned slightly underneath, perfectly adapted for bottom feeding.

KingdomAnimaliaPhylumChordataClassActinopterygiiOrderAcanthuriformesFamilySciaenidaeGenusAplodinotus

Freshwater Drum

Interesting facts

The freshwater drum is the only North American member of the Sciaenidae family that lives its entire life in freshwater.

Their ear stones, or otoliths, are exceptionally large and ivory-like; they have long been collected by beachcombers and Native Americans as 'lucky stones'.

They are incredibly long-lived; while most live around 7 to 14 years, scientists have found otoliths indicating some individuals have survived for over 70 years.

Unlike most North American freshwater fish that attach their eggs to the bottom, the freshwater drum releases buoyant, pelagic eggs that float freely near the surface.

Special abilities

Males possess specialized sonic muscles that repeatedly strike their swim bladder to create a deep, resonating drumming sound used to attract mates.

They have powerful pharyngeal (throat) teeth specially adapted to crush the hard shells of snails, clams, and mussels.

Their abnormally large inner ear stones provide exceptional balance and sensory perception in deep, murky water environments.

Measurements & details

Length: 30-75 cm
Weight: 1-16 kg
Lifespan: 7-72 years
Top Speed: 25 km/h
Clutch Size: 40000-90000
Incubation: 1-3 days

Diet & Feeding

A benthic predator that feeds primarily on hard-shelled mollusks, aquatic insects, and small crustaceans along the water's bottom.

Age differences: Juveniles feed mostly on zooplankton and small chironomid larvae, shifting heavily toward hard-shelled mollusks, crayfish, and small fish as they mature and develop stronger pharyngeal teeth.

Primary Foods

Zebra mussels
Snails
Aquatic insects
Small fish
Crayfish

Foraging Method

Foraging

Ecological connections

hunts

Zebra Mussel

Dreissena polymorpha

Feeds extensively on invasive zebra mussels, acting as a natural biological control agent.

eaten by

Northern Pike

Esox lucius

Juvenile drums are an important food source for large predatory sportfish.

competitor

Common Carp

Cyprinus carpio

Competes directly for benthic invertebrate food resources in shared habitats.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Freshwater Drum?

The easiest way to identify Freshwater Drum is to use the Snappit nature identifier app.

How long is Freshwater Drum?

30-75 cm

How much does Freshwater Drum weigh?

1-16 kg

How long does Freshwater Drum live?

7-72 years

How fast can Freshwater Drum move?

25 km/h

What does Freshwater Drum eat?

A benthic predator that feeds primarily on hard-shelled mollusks, aquatic insects, and small crustaceans along the water's bottom.

Where is Freshwater Drum usually found?

Found in the bottom waters of large, clear rivers, deep natural lakes, and expansive reservoirs, typically preferring areas with sandy or gravel substrates.

How does Freshwater Drum hunt?

Foraging